Eosinophils promote effector functions of lung ILC2s in allergic airway inflammation in mice
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PROVIDER: PRJNA909795 | ENA |
REPOSITORIES: ENA
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Project description:We investigated reciprocal interactions between cocultures of isolated populations of eosinophils and ILC2s and found these cells promote changes in gene expression as compared to being cultured alone.
2023-04-07 | GSE220453 | GEO
Project description:Group 2 innate lymphoid cells (ILC2s) have tissue-resident competence and contribute to the pathogenesis of allergic diseases. Therefore, there should be mechanisms to maintain the capacity of ILC2s to produce TH2 cytokines under chronic inflammatory conditions. Here, we report that Runx proteins are essential to prevent exaggerated activation of ILC2, in part by antagonizing GATA-3 function at steady state. However, during allergic inflammation, the absence of Runx in ILC2s impaired their ability to proliferate and produce effector TH2 cytokines and chemokines, but instead induced expression of T cell exhaustion markers including IL-10 and TIGIT. These exhausted ILC2s were unabale to induce type 2 immune responses against repeated allergen inhalation. Thus, Runx proteins protect ILC2s from exhaustion during continuous allergic inflammation.
2019-01-07 | GSE111871 | GEO
Project description:Triggering Receptor Expressed on Myeloid cells 1 (TREM-1) an innate receptor that canonically amplifies inflammatory signaling in neutrophils and monocytes, plays a central role in regulating lung inflammation. Utilizing a murine model of asthma, flow cytometry revealed TREM-1+ eosinophils in the lung tissue and airway during allergic airway inflammation. TREM-1 expression was restricted to recruited, inflammatory eosinophils. Expression was induced on bone marrow derived eosinophils by incubation with IL-33, LPS, or GM-CSF. Compared to TREM-1- airway eosinophils, TREM-1+ eosinophils were enriched for pro-inflammatory gene sets including migration, respiratory burst, and cytokine production. Unexpectedly, eosinophil-specific ablation of TREM-1 increased airway IL-5 and lung tissue eosinophil accumulation. Further investigation of transcriptional data revealed apoptosis related gene sets were enriched in TREM-1+ eosinophils. Annexin V staining demonstrated higher rates of apoptosis among TREM-1+ eosinophils compared to TREM-1- eosinophils in the inflammatory airway. In vitro, Trem1/3-/- eosinophils were protected from apoptosis. Finally, inhibition of reactive oxygen species production with diphenyleneiodonium protected WT bone marrow derived eosinophils from apoptosis more than Trem1/3-/- eosinophils, suggesting that superoxide accounted for more apoptosis in WT cells. These data demonstrate protein level expression of TREM-1 by eosinophils for the first time, define a population of TREM-1+ inflammatory eosinophils, and reveal that eosinophil TREM-1 restricts key features of type 2 lung inflammation.
2023-12-15 | GSE246389 | GEO
Project description:Group 2 innate lymphoid (ILC2) cells are major producers of the cytokines that drive allergic asthma and elevated levels of ILC2s have been detected in the blood and sputum of asthma patients. Asthma susceptibility has strong (epi)genetic components, but the underlying mechanisms and whether they are linked to ILC2 biology remain unclear. To reveal the molecular basis of ILC2 function in allergic airway inflammation (AAI) and assess its relevance for understanding how genetic variation affects asthma susceptibility. Gata3-IRES-YFP reporter mice were used to isolate ILC2s from bronchoalveolar lavage fluid and lymph nodes. Human naive ILC2s were purified from peripheral blood and activated in vitro. We employed RNA-Seq, ChIPm-Seq and computational approaches to study the transcriptome and epigenome in the context of ILC2 activation, tissue-specific functions and genetic susceptibility to asthma. Activated ILC2s displayed a tissue-specific gene expression signature that emerged from a highly similar epigenome. We identify superenhancers - a class of regulatory regions susceptible to epigenetic drugs - controlling ILC2 identity and asthma-associated genes. The majority of genes implicated in asthma by genome-wide association studies resided in an active or primed state in ILC2s. A substantial number of asthma-associated genetic variants were found in ILC2 gene regulatory elements. Our genome-wide analyses reveal new potential functions for ILC2s in AAI, which possess a plastic and flexible epigenome. Importantly, we reveal a strong link between gene regulatory mechanisms in ILC2s and the (epi)genetic basis of asthma susceptibility, supporting a pathogenic role for ILC2s in human asthma.
2021-05-03 | GSE90641 | GEO
Project description:Group 2 innate lymphoid cells (ILC2s) in the lung are stimulated by inhaled allergens. ILC2s do not directly recognize allergens but they are stimulated by cytokines including interleukin (IL)-33 released by damaged epithelium.Lung ILC2s, upon stimulation, produce T helper 2 cell-type cytokines inducing T cell independent allergic lung inflammation. We now report that lung ILC2s, upon activation by an allergen or IL-33, acquire the properties of memory cells. The activated ILC2s initially proliferate and secrete cytokines, followed by a contraction phase as they stop producing cytokines. Nevertheless, some persist long after the resolution of the inflammation and acquire intrinsic capacities to react to unrelated allergens more vigorously than naïve ILC2s, thus mediating a severe allergic lung inflammation. Gene expression profiles of the previously activated ILC2s show a gene signature of memory T cells. These antigen non-specific memory ILC2s may explain why asthma patients are often sensitized to multiple allergens. ILC2s were isolated from mouse lungs from naive and IL-33 injected mice 4 days, 14 days and 4 months after the initial treatment. RNA was extracted from those ILC2 populations and analyzed for gene expression profiles. RNA was also extracted from ILC2s isolated from lung draining mediastinal lymph node (mLN) 4 days and 14 days after IL-33 treatment.
2016-06-30 | E-GEOD-81700 | biostudies-arrayexpress
Project description:Persistent antigenic signalling leads to T cell exhaustion, a dysfunctional state arising in many chronic infections and cancers. Little is known concerning mechanisms limiting exhaustion in immune stimulatory diseases such as asthma. We report that membrane-associated RING-CH1 (MARCH1), the ubiquitin ligase that mediates surface turnover of MHCII and CD86 in professional APCs, plays an essential role in restraining exhaustion of effector CD4+ T cells in a mouse model of asthma. Mice lacking MARCH1 or the ubiquitin acceptor sites of MHCII and CD86 exhibited increased MHCII and CD86 surface expression on lung APCs, and this increase promoted enhanced expression of immune inhibitory receptors by effector CD4+ T cells and inhibited their proliferation. Remarkably, ablation of MARCH1 in mice with established asthma reduced airway infiltration of eosinophils and Th2 cells. Thus, MARCH1 controls exhaustion of effector CD4+ T cells during allergic airway inflammation and may serve as a therapeutic target for asthma.
2022-08-24 | GSE211511 | GEO
Project description:Runx/Cbfβ complexes protect ILC2s from exhaustion during allergic airway inflammation
| PRJNA438449 | ENA
Project description:Background DJ-1 is an antioxidant protein known to regulate mast cell mediated allergic response, but its role in airway eosinophilic interactions and allergic inflammation is not known. Objective The aim of this study was to investigate the role of DJ-1 in airway eosinophilic inflammation in vitro and in vivo. Methods Ovalbumin-induced airway allergic inflammation was established in mice. ELISA was adopted to analyze DJ-1 and cytokine levels in mouse bronchoalveolar lavage fluid. Transcriptional profiling of mouse lung tissues was conducted by single-cell RNA sequencing technology. The role of DJ-1 in the differentiation of airway progenitor cells into goblet cells was examined by organoid cultures, immunofluorescence staining, quantitative PCR, and cell transplantation in normal, DJ-1 knockout (KO), or conditional DJ-1 KO mice. Results We observed that DJ-1 was increased in the lung tissues of ovalbumin-sensitized and challenged mice. DJ-1 KO mice exhibited reduced airway eosinophil infiltration and goblet cell differentiation. Mechanistically, we discovered that eosinophil-club cell interactions are reduced in the absence of DJ-1. Organoid cultures indicated that eosinophils impair the proliferative potential of club cells. Intratracheal transplantation of DJ-1-deficient eosinophils suppresses airway goblet cell differentiation. Loss of DJ-1 inhibits the metabolism of arachidonic acid into cysteinyl leukotrienes in eosinophils while these secreted metabolites promote airway goblet cell fate in organoid cultures and in vivo. Conclusion DJ-1-mediated interactions between airway epithelial progenitor cells and immune cells are essential in controlling airway goblet cell metaplasia and eosinophilia. Blockade of the DJ-1 pathway is protective against airway allergic inflammation.
2022-12-21 | GSE203079 | GEO
Project description:Type 2 innate lymphoid cells (ILC2s) play a pivotal role in type 2 asthma. CD226 is a costimulatory molecule involved in various inflammatory diseases. Here, we aimed to investigate CD226 expression and function within human and mouse ILC2s, and to assess the impact of targeting CD226 on ILC2-mediated airway hyperreactivity (AHR). Our findings demonstrated an inducible expression of CD226 in activated ILC2s, enhancing their cytokine secretion and effector functions. Blocking CD226 ameliorates ILC2-dependent AHR in IL-33 and Alternaria Alternata-induced models. Interestingly, CD226 is expressed and inducible in human ILC2s, and its blocking reduces cytokine production. Finally, we showed that peripheral ILC2s in asthmatic patients exhibited elevated CD226 expression compared to healthy controls.Our findings underscore the potential of CD226 as a novel therapeutic target in ILC2s, presenting a promising avenue for ameliorating AHR and allergic asthma.
2024-04-16 | GSE264060 | GEO
Project description:Mast cells, basophils, and eosinophils play an important role in allergic disorders as effector cells. These cells secrete abundant serine proteases as well as chemical mediators and cytokines. Various serine proteases including SLPI are also important for to regulate an allergic response in these effector cells, although the expression profiles and functions of these proteases still remain unclear. We carried out DNA microarrays to clarify the role of SLPI in allergic responses.
2017-12-21 | GSE87638 | GEO